JP2006110005A - Headrest device of chair - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a headrest device of a chair capable of maintaining sufficient strength for stably supporting the head part of a sitting person, being easily and quickly assembled, being light in weight and excellent in air permeability and presenting a beautiful appearance. <P>SOLUTION: The lower end part of a base frame 14 whose front shape forms a closed loop shape and thickness in front and back directions is gradually increased from the upper part to the lower part is attached to the upper part of the backrest 7 of the chair. A stretch material 12 is stretched on the front surface of a stretch frame 15 forming the closed loop shape which is roughly the same shape as the base frame 14, a plurality of locking shafts 26, 29 and 31 projecting on the front surface of the base frame 14 at appropriate intervals along the outer peripheral edge of the base frame 14 are fitted and locked to a step hole 27 provided on a part corresponding to the locking shaft on the rear side surface of the stretch frame 15 and locked, and thus the stretch frame 15 is attached to the front surface of the base frame 14. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a headrest device that is attached to an upper part of a backrest of a chair and supports a head of a seated person.

  Most conventional headrest devices for chairs are provided with a cushioning material on the front surface of a plate-like core attached to the upper part of the backrest of the chair, and the front surface is covered with a surface material such as cloth (for example, patents). Reference 1 and 2).

Also, in recent years, it is known that the seat and back of a chair are simply a net-like tension material stretched on the frame that forms the outer shape thereof, and the seat and back are made see-through ( For example, see Patent Document 3).
Japanese Utility Model Publication No. 5-72249 JP 2004-57397 A Japanese National Patent Publication No. 8-507935

  In a chair using a net-like upholstery for the above-mentioned seat and backrest, it is desired that the headrest is also see-through using a net-like upholstery.

However, since the headrest is generally configured such that the lower end portion is supported only by the upper end portion of the backrest, when the headrest is composed of only the frame body and the net-like tension material stretched on the frame body, Stress concentrates especially on the lower part of the body, and it is difficult to stably support the head of the seated person.
Therefore, a conventional chair seat or backrest structure using a net-like tension material cannot be applied to the headrest as it is.

  The present invention has been made in view of the above circumstances, and can maintain sufficient strength to stably support the head of a seated person, and can be easily and quickly assembled, and is lightweight. An object of the present invention is to provide a headrest device for a chair that has good breathability and a beautiful appearance.

According to the present invention, the above problem is solved as follows.
(1) The front shape is a closed loop, and the lower end of the base frame, whose thickness in the front-rear direction is gradually increased from the upper part toward the lower part, is attached to the upper part of the backrest of the chair. A tension member is stretched on the front surface of the tension frame having a closed loop shape, and a plurality of locking shafts protruding at appropriate intervals along the outer peripheral edge of the base frame are provided on the front surface of the base frame. The tension frame is attached to the front surface of the base frame by fitting and locking in a stepped hole provided at a position corresponding to the locking shaft on the rear surface.

(2) In the above item (1), the front end opening of the stepped hole in the tension frame is covered with the tension material.

(3) In the above item (1) or (2), the locking shaft has an elastic locking claw that extends rearward at the tip, and this elastic locking claw is stepped on the tension frame. The hole is locked to a step formed between a large-diameter hole at the front of the hole and a small-diameter hole at the rear.

(4) In any one of the above items (1) to (3), the locking shaft has a cylindrical shape having an elastic locking claw that expands toward the rear at the tip of a boss protruding from the front surface of the base frame. Assume that the washer is screwed from the front.

(5) In any of the above items (1) to (4), the tension member is wound around the outer periphery from the front surface of the tension frame to reach the rear surface, and the edge material fixed to the edge of the tension member is stretched. The frame member is fitted into a groove provided on the rear surface of the frame, and the front surface of the base frame is brought into contact with the rear end of the frame member through a tension member, thereby preventing the frame member from coming off the groove.

(1) According to the invention described in claim 1, since the lower end portion of the base frame whose thickness in the front-rear direction is gradually increased from the upper portion toward the lower portion is attached to the upper portion of the backrest of the chair, Strength enough to support the part stably, and a tension frame with a tension material on the front is pressed toward the front of the base frame to stretch the locking shaft of the base frame. It is possible to assemble easily and quickly simply by engaging the stepped hole of the frame.
In addition, since it is lightweight and the only part that the seated person hits is the upholstery material, it has good air permeability and the hair does not get muggy even in summer.
Moreover, the appearance is good, especially when the upholstery is made into a net or mesh, the back of the upholstery can be seen (see-through), and a beautiful appearance can be exhibited.

(2) According to the invention described in claim 2, since the front end opening of the stepped hole in the tension frame is covered with the tension material, projections such as holes and screw heads are formed on the outer surface of the base frame and tension material. There is no exposure and the appearance is good.

(3) According to the invention of claim 3, it is ensured that the tension frame is detached from the base frame by the elastic locking claw of the locking shaft being locked to the step portion of the stepped hole in the tension frame. Can be prevented.

(4) According to the invention described in claim 4, not only can the same effect as that of the invention described in claim 3 be achieved, but also when the chair is discarded or the tension material is replaced, the tool is pierced into the tension material. The tip is engaged with the head of the screw holding the cylindrical washer, and in that state, the screw is unscrewed and removed from the boss together with the cylindrical washer. The upholstery can be disposed of separately or replaced.

(5) According to the fifth aspect of the present invention, the front edge of the base frame abuts against the rear end of the edge member via the tension member, so that the edge of the tension member and the edge material are surely secured from the groove on the rear surface of the tension frame. This prevents the tensioning material from sagging, and when the tensioning frame is removed from the base frame, the edge of the tensioning material and the edge material are removed from the groove on the rear surface of the base frame. Since there is no longer any obstacle, it is possible to easily remove the tension material from the tension frame.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
1-10 show a chair comprising one embodiment of the present invention. As shown in FIG. 1 and FIG. 2, in this chair, the support column (2) stands up at the base of five legs (1) extending radially, and the upper end of the support column (2) is rotated in the horizontal plane. A support base (3) is movably attached. A caster (4) is attached to the tip of each leg (1).

  A pivot shaft (5) facing in the left-right direction is penetrated through the middle portion in the front-rear direction of the support base (3) so as to be rotatable around its central axis, and at both ends of the pivot shaft (5), The front end portions of the lower forward portions 6a and 6a of the pair of left and right back support rods 6 and 6 that are substantially L-shaped in a side view are fixed. The backrest support rods (6) and (6) support the backrest (7) by standing portions (6b) and (6b) that stand up from the rear ends of the forward facing portions (6a) and (6a).

  Each backrest support ridge (6) is connected to the rear lower part of the seat (8) above the forward portion (6a), and in conjunction with the backrest (7) tilting backward, The seat (8) moves rearward and downward. The back tilt of the backrest (7) and the movement of the seat (8) are controlled by a reclining control device (not shown).

  A substantially L-shaped elbow frame (9) in front view extends from the substantially central outer surface of the forward-facing portion (6a) of the backrest support rods (6) and (6), and the standing portion of the elbow frame (9) An armrest (10) is provided at the upper end of (9a).

  As shown in FIGS. 1-3, the headrest (11) is installed in the upper end part of the backrest (7). The seat (8), the backrest (7), and the headrest (11) are all made of a frame and a net-like tension material made of a high-strength plastic or other appropriate material stretched on the seated person side. 12).

  As shown in FIG. 4, the back frame (13), which is closed in a substantially rectangular shape when viewed from the front of the back (7), is curved so that the upper frame portion is recessed backward. Left and right rear upper frame (13b) curved in such a way that the central part is recessed backward with a smaller radius of curvature than the front upper frame (13a) on both sides of the rear upper frame (13a) facing left and right ) Are integrally formed so as to form a substantially crescent shape in plan view. The rear upper frame (13b) forms a recumbent for supporting the headrest, but in this embodiment, by integrally molding with the front upper frame (13a), the number of parts is reduced, It saves time and effort.

  As shown in FIG. 5, the headrest (11) has a closed loop shape in the front shape, in this example, a substantially trapezoidal base frame (14), and is substantially the same shape as the base frame (14) fitted on the front surface. It consists of a tension frame (15) and a net-shaped tension material (12) stretched on the front side of the tension frame (omitted in FIG. 5).

  As shown in FIG. 6, the lower end portion of the base frame (14) is provided with a concave groove (14a) facing in the longitudinal direction at the center of the lower surface thereof, so that the front hanging piece (14b) formed on the front and rear sides thereof and the rear A bifurcated portion (14d) composed of a hanging piece (14c) is formed. The base frame (14) is attached to the central portion of the rear upper frame in a stable manner by straddling the bifurcated portion (14d) on the rear upper frame (13b) from above. Therefore, the lower part of the base frame (14) is curved in the plan view with the same curvature as the rear upper frame (13b). Further, the inner surface shape of the concave groove (14a) is such that the front hanging piece (14b) and the rear hanging piece (14c) are welded to the front and rear surfaces of the rear upper frame (13b) so that the upper portion of the rear upper frame (13b) is welded. It is formed so as to have a complementary shape with the cross-sectional shape, so that no wobbling occurs when the seated person places his head on the headrest (11).

  Since the headrest (11) is attached to the rear upper frame (13b) of the backrest frame (13), the back side of the seated person leaning against the backrest and the rear side of the neck touch the lower part of the base frame (14). There's nothing, and you don't feel uncomfortable. In addition, the headrest (11) is curved so that the lower center part is recessed backward, and is externally fitted to the rear upper frame (13b) of the backrest frame (13). The structure is strong against external forces. Furthermore, positioning of the headrest (11) with respect to the rear upper frame (13b) is easy.

  As shown in FIGS. 3 to 6, in the center of the front hanging piece (14b) and the rear hanging piece (14c) in the base frame (14) and the rear upper frame (13b) of the backrest frame (13), A pair of left and right bolt insertion holes (16), (16) facing in the front-rear direction are drilled, and bolts (18) are inserted through these bolt insertion holes (16) from the rear, respectively, The headrest (11) is screwed into the screw holes (19) and (19) in a pair of left and right bosses (18a) and (18a) provided on the receiving plate (18) applied to the front surface of the frame (13b). ) Is firmly fixed to the backrest (7).

  After screwing the bolt (17), place the horizontally long cover plate (20) in the center of the rear surface of the rear hanging piece (14c) so as to straddle the left and right bolt insertion holes (16) (16). A pair of left and right elastic locking claws (20a) and (20a) are provided in the center of the rear hanging piece (14c) on the front surface of the cover plate (20). If the head of each bolt (17) is covered with the cover plate (20) by being locked to the step (22a) of the stepped engagement hole (22), a good appearance may be exhibited. it can.

  When the headrest (11) is not used, the cover plate (20) is removed from the rear surface of the rear drooping piece (14c), and the rear upper frame (13b) from which the headrest (11) is removed as shown in FIG. ) Fitted in a recess (23) similar to the recess (21) provided in the center of the rear surface in advance, and both elastic locking claws (20a) (20a) are connected to the rear upper frame (13b). Cover the left and right bolt insertion holes (16), (16) with the cover plate (20) by engaging with the step (22a) of the same stepped engagement hole (22) provided in the center. , Can exhibit a good appearance.

  The tension mode of the tension material (12) in the headrest (11) of the present embodiment is as follows. In addition, although the tension | tensile_strength aspect of the tension | tensile_strength material (12) in the backrest (7) is different from this, since the tension | tensile_strength aspect is not directly related to this invention, the description is abbreviate | omitted. As shown in FIG. 1, FIG. 3 and FIG. 4, the tension member (12) is stretched while maintaining a constant tension from the front surface (15a) to the outer peripheral surface (15b) of the tension frame (15) of the headrest (11). The peripheral edge portion also covers the rear peripheral edge portion (15c) of the tension frame (15). When the tension frame (15) and the base frame (14) are fitted (see FIGS. 8 to 10), the tension member (12) is gripped by being sandwiched between them.

  As shown in detail in FIG. 8, a flexible edge member (24) having an L-shaped cross section consisting of a short portion (24a) and a long portion (24b) is formed on the peripheral portion of the tension member (12). Is fixed by welding or the like. A groove (25) facing forward is provided on the inner side of the rear peripheral edge portion (15c) of the tension frame (15), and is fixed to the long portion (24b) of the edge member (24) and to this. The edge of the tension member (12) is inserted into the groove (25).

  As shown in FIG. 5, a front boss (26) is provided on the front surface of the base frame (14), and a stepped hole (27) is provided on the tension frame (15). Is provided. The boss (26) is provided with a screw hole (28), and a screw insertion hole (30) is formed at the center of a cylindrical washer (29) formed of an elastically deformable material. Yes. The cylindrical washer (29) is fastened to the tip surface of the boss (26) by the screw (31) inserted through the screw insertion hole (30) and fastened to the screw hole (28) of the boss (26). Has been. Further, on the outer peripheral surface of the cylindrical washer (29), a plurality of elastic locking claws (29a) that expand toward the rear are provided at equal intervals in the circumferential direction. The boss (26), the cylindrical washer (29), and the screw (31) form a locking shaft that is locked to the stepped hole (27).

  A step portion (27c) is formed between the front large-diameter hole (27a) and the rear small-diameter hole (27b) in the stepped hole (27) of the tension frame (15). The front end opening of the large-diameter hole (27a) is covered with a tension member (12). The cylindrical washer (29) is positioned in the large-diameter hole (27a), and the rear end of the elastic locking claw (29a) is locked to the stepped portion (27c). It is prevented from coming forward from the frame (14).

  On the outer peripheral edge of the base frame (14) outside the boss (26), a step portion (32) that is recessed from the front is formed, and this step portion (32) is interposed via a tension member (12). By contacting the rear surface of the short part (24a) of the edge member (24), the edge parts of the edge member (24) and the tension member (12) are prevented from coming out of the groove (25).

  The procedure for assembling the base frame (14) and the tension frame (15) and tensioning the tension member (12) will be described below with reference to FIGS. As shown in both figures, the assembly of the tension frame (15) and the tension material (12) and the assembly of the base frame (14), the screw (26), and the cylindrical washer (27) are performed separately, and then Unite each other.

  First, as shown by the arrow (A) in FIG. 9, the peripheral edge of the tension member (12) is wound from the front surface (15a) to the outer peripheral surface (15b) and the rear peripheral edge (15c) of the tension frame (15), Together with the insertion piece (24) fixed to this, it is inserted into the groove (25) of the tension frame (15). At this time, as shown by an arrow (B), the tension member (12) is in close contact with the rear peripheral edge (15c), the outer peripheral surface (15b), and the front surface (15a) of the tension frame (15).

  Further, as shown by an arrow (C) in FIG. 9, the screw (31) is passed through the bolt insertion hole (30) of the cylindrical washer (29) and further into the screw hole (28) provided in the boss (26). Screw together.

  As a result, as shown in FIG. 10, the cylindrical washer (29) is fixed to the boss (26) in a state where the elastic locking claw (29a) protrudes outward from the outer peripheral surface of the boss (26). Is done.

  Next, as shown by an arrow (D) in FIG. 10, the assembly (33) assembled with the tension frame (15) and the tension material (12) is connected to the boss (26) of the base frame (14) and the cylindrical washer (29). ) And the assembly (34) into which the screw (31) is combined.

  Then, first, the cylindrical washer (29) enters the small diameter hole (27b), and the elastic locking claw (29a) is gradually reduced in diameter by sliding contact with the inner surface of the small diameter hole (27b), Thereby, the cylindrical washer (29) can pass through the small diameter hole (27b).

  When the cylindrical washer (29) finishes passing through the small diameter hole (27b), the elastic engagement claw (29a) expands to its original state due to elasticity, and the rear end thereof has a large diameter hole as shown in FIG. The cylindrical washer (29) cannot be pulled out through the small diameter hole (27b) by engaging with the step (27c) between (27a) and the small diameter hole (27b).

  In the present embodiment, in order to simplify the attachment work of the base frame (14) and the tension frame (15), as shown in FIGS. 1 and 5, a stepped hole (27) (and thus a cylindrical washer (29 )) Minimizes the number of cylindrical washers (29) provided alternately in the vertical direction and screwed.

  If it is necessary to separate the tension material (12) for separating the material when the chair is discarded, check the position of the screw (31) through the net-shaped tension material (12) and tighten a tool such as a screwdriver. Insert the material (12) while tearing it, turn it around the head of the screw (31), and remove the cylindrical washer (29) together with the screw (31) from the boss (26). (15) can be separated. Therefore, thereafter, the edge of the tension member (12) can be pulled out from the groove (25) of the tension frame (15) together with the insertion piece (24).

It is a front view of a chair provided with one embodiment of the present invention. Similarly, it is a side view. Similarly, it is a rear view of the chair upper part. FIG. 4 is a transverse plan view taken along line IV-IV in FIG. 2. It is a disassembled perspective view of the frame of a headrest. It is sectional drawing which follows the VI-VI line of FIG. It is sectional drawing of the part similar to FIG. 4 when not using a headrest. It is an expanded sectional view of the VIII part in FIG. Similarly, it is an exploded sectional view. Similarly, it is sectional drawing which assembled a part.

Explanation of symbols

(1) Leg
(2) Prop
(3) Support base
(4) Casters
(5) Axis
(6) Back support heel
(6a) Forward part
(6b) Standing part
(7) Backrest
(8) Seat
(9) Elbow frame
(9a) Standing part
(10) Armrest
(11) Headrest
(12) Upholstery
(13) Backrest frame
(13a) Front upper frame
(13b) Rear upper frame (Bubo)
(14) Base frame
(14a) Groove
(14b) Front drooping piece
(14c) Rear drooping piece
(14d) Fork
(15) Tension frame
(15a) Front
(15b) Outer surface
(15c) Rear edge
(16) Bolt insertion hole
(17) Bolt
(18) Back plate
(18a) Boss
(19) Screw hole
(20) Cover plate
(20a) Elastic locking claw
(21) Recess
(22) Stepped engagement hole
(22a) Step
(23) Recess
(24) Edge material
(24a) Short part
(24b) Long dimension
(25) Groove
(26) Boss
(27) Stepped hole
(27a) Large diameter hole
(27b) Small diameter hole
(27c) Step
(28) Screw hole
(29) Cylindrical washer
(29a) Elastic locking claw
(30) Screw insertion hole
(31) Screw
(32) Step
(33) (34) Assembly

Claims (5)

  The front shape is a closed loop shape, and the lower end of the base frame whose thickness in the front-rear direction is gradually increased from the upper part toward the lower part is attached to the upper part of the backrest of the chair, and the closed loop shape is almost the same shape as the base frame. A tension member is stretched on the front surface of the tension frame, and a plurality of locking shafts are provided on the front surface of the base frame along the outer periphery of the base frame at appropriate intervals. A headrest device for a chair, wherein the tension frame is attached to a front surface of a base frame by fitting and locking in a stepped hole provided at a position corresponding to the locking shaft.   The headrest device for a chair according to claim 1, wherein a front end opening of the stepped hole in the tension frame is covered with a tension material.   The locking shaft has an elastic locking claw that expands toward the rear at the tip, and this elastic locking claw is formed between a large-diameter hole in front of the stepped hole in the tension frame and a small-diameter hole in the rear. The headrest device for a chair according to claim 1, wherein the headrest device is locked to a step portion formed therebetween.   A cylindrical washer having an elastic locking claw that expands rearward is screwed from the front to the tip of a boss protruding from the front surface of the base frame. The headrest apparatus of the chair in any one of 1-3. Wind the tension material from the front of the tension frame to the rear surface around the outer periphery, and fit the edge material fixed to the edge of the tension material into the groove provided on the rear surface of the tension frame, and The headrest device for a chair according to any one of claims 1 to 4, wherein an edge member is prevented from slipping out of the groove by bringing a front surface of a base frame into contact with an end via a tension member.

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